DP-850 CT Sim & TPS QA phantom

The DP-850 fully complies with AAPM TG-66 requirements for CT simulators as well as key components of AAPM TG-53 for treatment planning system quality assurance. It is constructed of a solid material with a relative density value of 0.85 (relative to water) as the background material. It consists of 4 primary modules that are assembled using rods of a density similar to trabecular bone around the periphery of the DP-850. To optimise functionality it contains various internal structures, test objects, fiducials and external alignment etchings.

CT SIMULATOR QA (AAPMTG-66)

• Alignment & Orientation of Gantry Lasers to Center of Imaging Plane
• Lateral Wall Laser Spacing to Lateral Gantry Lasers & Scan Plane
• Orientation of Wall Lasers to Imaging Plane
• Orientation of Ceiling Laser to Imaging Plane
• Orientation of CT-Scanner Couch to Imaging Plane
• Couch Vertical and Longitudinal Motion
• Couch Indexing and Position
• Gantry Tilt Accuracy
• Gantry Tilt Position Accuracy
• Scan Localisation
• Radiation Profile Width
• Sensitivity Profile Width
• CT Number Constancy
• Image Noise
• In plane spatial integrity
• Field uniformity
• Spatial resolution
• Contrast resolution

VIRTUAL SIMULATION TESTS

• Hidden target localization accuracy
• Contouring accuracy
• Laser movement accuracy

TREATMENT PLANNING SYSTEM

• Deformable Registration
• DICOM transfer accuracy
• Image quality verification (Resolution, CT number Constancy/Linearity, Uniformity)
• Spatial integrity
• Volume calculation accuracy
• Margin creation accuracy
• DRR spatial accuracy
• DVH Accuracy
• Dose Accuracy

TREATMENT IMAGING SYSTEM (kV, MV, & CBCT)

• DICOM transfer accuracy
• Volume transfer accuracy
• Spatial integrity accuracy
• TG -142 position/re-position test
• TG -142 monthly

TREATMENT DELIVERY SYSTEM

• Plan delivery accuracy (dose) for heterogeneous target and critical structures (Chamber, OSL, & Film Measurements)
• Single chamber IMRT QA dose measurement
• Target localisation delivery accuracy